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Classify triangles by their angles

4th grade (Year 5 in England) · 16 questions · Common Core: 4.G.A.2 · England: Y5 Geometry

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Date

Score/ 16

  1. Question 1

    A triangle has angles of 66°, 96°, 18°. What type of triangle is it?

    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  2. Question 2

    Chloe says: "A triangle can have two right angles." True or false?

    • A. true
    • B. false

  3. Question 3

    A triangle has angles of 90°, 32°, 58°. What type of triangle is it?

    90°32°58°
    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  4. Question 4

    Nia says: "A triangle can have two obtuse angles." True or false?

    • A. true
    • B. false

  5. Question 5

    A triangle has angles of 115°, 39°, 26°. What type of triangle is it?

    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  6. Question 6

    Elena says: "A triangle can have two obtuse angles." True or false?

    • A. true
    • B. false

  7. Question 7

    A triangle has angles of 48°, 42°, 90°. What type of triangle is it?

    90°48°42°
    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  8. Question 8

    Zara says: "A right-angled triangle can also be isosceles." True or false?

    • A. true
    • B. false

  9. Question 9

    A triangle has angles of 38°, 121°, 21°. What type of triangle is it?

    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  10. Question 10

    Ethan says: "A right-angled triangle can also be isosceles." True or false?

    • A. true
    • B. false

  11. Question 11

    A triangle has angles of 60°, 60°, 60°. What type of triangle is it?

    60°60°60°
    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  12. Question 12

    Daniel says: "Every triangle has at least two acute angles." True or false?

    • A. true
    • B. false

  13. Question 13

    A triangle has angles of 41°, 20°, 119°. What type of triangle is it?

    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  14. Question 14

    Hiro says: "A right-angled triangle can also be isosceles." True or false?

    • A. true
    • B. false

  15. Question 15

    A triangle has angles of 71°, 41°, 68°. What type of triangle is it?

    71°41°68°
    • A. acute-angled
    • B. right-angled
    • C. obtuse-angled

  16. Question 16

    Diego says: "A right-angled triangle can also be isosceles." True or false?

    • A. true
    • B. false

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Answer key: Classify triangles by their angles

  1. 1. C. obtuse-angled

  2. 2. B. false

  3. 3. B. right-angled

  4. 4. B. false

  5. 5. C. obtuse-angled

  6. 6. B. false

  7. 7. B. right-angled

  8. 8. A. true

  9. 9. C. obtuse-angled

  10. 10. A. true

  11. 11. A. acute-angled

  12. 12. A. true

  13. 13. C. obtuse-angled

  14. 14. A. true

  15. 15. A. acute-angled

  16. 16. A. true